Ribbed Vapor-Permeable Membranes With Adhesive Ribs
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Solution Overview
Problem
Existing building envelope membranes lack effective water vapor permeability and adhesion properties, which can lead to moisture issues and compromised structural integrity.
Innovation Solution
A water vapor permeable ribbed membrane system with an adhesive layer on its ribs, allowing for enhanced adhesion and permeability, maintaining structural integrity while allowing moisture vapor transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If building envelope membranes are designed to withstand numerous elements as protective barriers, then their strength and durability are improved, but their water vapor permeability deteriorates
Solution Approach 1:
The patent employs a flexible membrane structure with a specific thickness range (0.002 to 0.05 inches) that provides protective barrier strength while maintaining flexibility for vapor transmission. The thin film design allows water vapor molecules to pass through while still providing mechanical protection against environmental elements.
Solution Approach 2:
The membrane incorporates a porous structure with controlled pore sizes that enable water vapor permeability while maintaining structural integrity. The porosity allows selective transmission of water vapor molecules while blocking liquid water and providing mechanical strength to withstand environmental elements.
2Strength
If adhesive layer is applied to cover entire bottom surface for maximum adhesion, then adhesion strength is improved, but water vapor permeability deteriorates
Solution Approach 1:
The adhesive layer is strategically positioned only on the ribs rather than covering the entire bottom surface. This localized adhesive application provides sufficient adhesion strength to secure the membrane while leaving the valleys exposed to maintain water vapor permeability pathways through the membrane structure.
Solution Approach 2:
The membrane bottom surface is segmented into ribs and valleys, with adhesive applied only to the ribs. This segmentation creates distinct functional zones: the ribs provide adhesion anchors while the valleys serve as vapor transmission channels, resolving the contradiction between adhesion strength and vapor permeability.
3Adaptability or versatility
If ribs are added to the membrane structure for adhesion, then adhesion capability is improved, but device complexity increases
Solution Approach 1:
The ribs are integrated directly into the membrane structure as an inherent feature rather than being added as separate components. This merging of the rib structure with the membrane body provides adhesion capability while avoiding the complexity of separate rib attachments or additional assembly steps.
Solution Approach 2:
The ribs are formed as integral features of the thin flexible membrane, maintaining the overall simplicity of the membrane structure. The rib geometry is optimized to provide adequate adhesion surface area without significantly increasing the overall thickness or structural complexity of the thin film membrane.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system provides improved water vapor permeability and adhesion, ensuring effective moisture management and structural stability in building envelopes.
Implementation Method 1
an adhesive layer located on the plurality of ribs
Implementation Method 2
water vapor permeable ribbed membranes
Data Source
AI summary
Water vapor permeable ribbed membranes and related methods are provided. A water vapor permeable ribbed membrane has a top surface and a bottom surface opposite the top surface. The water vapor permeable ribbed membrane comprises a plurality of ribs located on at least the bottom surface. An adhesive layer is located on the plurality of ribs. When the adhesive layer is adhered to a top surface of another water vapor permeable ribbed membrane, the adhesive layer has a peel adhesion of at least 1.5 lb/in, as measured according to ASTM D3330 (Method B). The water vapor permeable ribbed membrane has a water vapor permeability of greater than 10 perms, as measured according to ASTM E96B.